Sumatra is home to one species of orangutan, a species of critically endangered elephant, and the Sumatran tiger, but half of Sumatra’s forest is now gone. The neighboring island of Borneo, home to the other species of orangutan, has lost a similar area of forest. Forest loss continues in protected areas of Borneo. All three species of orangutan are now listed as endangered by the International Union for Conservation of Nature (IUCN), but they are simply the most visible of thousands of species that will not survive the disappearance of the forests in Sumatra and Borneo. This is an example of which type of threat to biodiversity?
a. introduction of exotic species
b. global climate change
c. habitat loss
d. overharvesting
c. habitat loss
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Which of the following nitrogenous bases is usually found in RNA but not in DNA?
A. Adenine B. Uracil C. Thymine D. Guanine
Which of the following is not a mechanism to circumvent the limits imposed by diffusion?
A. placing metabolically active cells in the interior of an organism and metabolically inert structures along the exterior surface B. using vascular tissue to transport materials throughout the plant body C. placing metabolically active cells along a series of canals and pores D. using a circulatory system to distribute materials throughout the animal body E. All of these options are mechanisms to circumvent the limits of diffusion.
Sexual selection, such as occurs when males compete for access to fertile females, frequently influences aspects of body form and can lead to _____
a. male/female differences b. male aggression c. exaggerated traits d. all of these
Which of the following is NOT a defining trait
found in chordate embryos?
a. notochord b. dorsal, hollow nerve chord c. gill slits d. muscular tail e. limb buds